Hello guys, I've been trying to solve this problem all night and was wondering if I could get some help.
1. Suppose A is nxn nonsingular. Prove Det(A^-1) = 1 / Det(A)
I was trying to use the formula A^-1 = 1 / det(A) * adj(A) but had no luck
2. A = | 1/2 -1/2 | find A^-1
| 1/2x 1/2x|
I keep getting
1 1/x
-1 x